diff --git a/src/vs/workbench/contrib/terminal/browser/terminal.ts b/src/vs/workbench/contrib/terminal/browser/terminal.ts
index d9c9c6f1adf0d..3fd1d297a431b 100644
--- a/src/vs/workbench/contrib/terminal/browser/terminal.ts
+++ b/src/vs/workbench/contrib/terminal/browser/terminal.ts
@@ -624,7 +624,7 @@ export interface ITerminalEditorService extends ITerminalInstanceHost {
 
 	openEditor(instance: ITerminalInstance, editorOptions?: TerminalEditorLocation): Promise<void>;
 	detachInstance(instance: ITerminalInstance): void;
-	splitInstance(instanceToSplit: ITerminalInstance, shellLaunchConfig?: IShellLaunchConfig): ITerminalInstance;
+	splitInstance(instanceToSplit: ITerminalInstance, shellLaunchConfig?: IShellLaunchConfig): Promise<ITerminalInstance>;
 	revealActiveEditor(preserveFocus?: boolean): Promise<void>;
 	resolveResource(instance: ITerminalInstance): URI;
 	reviveInput(deserializedInput: IDeserializedTerminalEditorInput): EditorInput;
diff --git a/src/vs/workbench/contrib/terminal/browser/terminalEditorService.ts b/src/vs/workbench/contrib/terminal/browser/terminalEditorService.ts
index 4f8a381ebeee9..3bf35662d68e0 100644
--- a/src/vs/workbench/contrib/terminal/browser/terminalEditorService.ts
+++ b/src/vs/workbench/contrib/terminal/browser/terminalEditorService.ts
@@ -212,7 +212,7 @@ export class TerminalEditorService extends Disposable implements ITerminalEditor
 		return getInstanceFromResource(this.instances, resource);
 	}
 
-	splitInstance(instanceToSplit: ITerminalInstance, shellLaunchConfig: IShellLaunchConfig = {}): ITerminalInstance {
+	async splitInstance(instanceToSplit: ITerminalInstance, shellLaunchConfig: IShellLaunchConfig = {}): Promise<ITerminalInstance> {
 		if (instanceToSplit.target === TerminalLocation.Editor) {
 			// Make sure the instance to split's group is active
 			const group = this._editorInputs.get(instanceToSplit.resource.path)?.group;
@@ -223,7 +223,7 @@ export class TerminalEditorService extends Disposable implements ITerminalEditor
 		const instance = this._terminalInstanceService.createInstance(shellLaunchConfig, TerminalLocation.Editor);
 		const resource = this.resolveResource(instance);
 		if (resource) {
-			this._editorService.openEditor({
+			await this._editorService.openEditor({
 				resource: URI.revive(resource),
 				description: instance.description,
 				options: {
diff --git a/src/vs/workbench/contrib/terminal/browser/terminalService.ts b/src/vs/workbench/contrib/terminal/browser/terminalService.ts
index 5eaceee04d043..31ea089a3b0db 100644
--- a/src/vs/workbench/contrib/terminal/browser/terminalService.ts
+++ b/src/vs/workbench/contrib/terminal/browser/terminalService.ts
@@ -1066,7 +1066,7 @@ export class TerminalService extends Disposable implements ITerminalService {
 		this._extensionService.activateByEvent('onTerminal:*');
 		let instance;
 		if (parent) {
-			instance = this._splitTerminal(shellLaunchConfig, location, parent);
+			instance = await this._splitTerminal(shellLaunchConfig, location, parent);
 		} else {
 			instance = this._createTerminal(shellLaunchConfig, location, options);
 		}
@@ -1135,7 +1135,7 @@ export class TerminalService extends Disposable implements ITerminalService {
 		}
 	}
 
-	private _splitTerminal(shellLaunchConfig: IShellLaunchConfig, location: TerminalLocation, parent: ITerminalInstance): ITerminalInstance {
+	private async _splitTerminal(shellLaunchConfig: IShellLaunchConfig, location: TerminalLocation, parent: ITerminalInstance): Promise<ITerminalInstance> {
 		let instance;
 		// Use the URI from the base instance if it exists, this will correctly split local terminals
 		if (typeof shellLaunchConfig.cwd !== 'object' && typeof parent.shellLaunchConfig.cwd === 'object') {
@@ -1146,7 +1146,7 @@ export class TerminalService extends Disposable implements ITerminalService {
 			});
 		}
 		if (location === TerminalLocation.Editor || parent.target === TerminalLocation.Editor) {
-			instance = this._terminalEditorService.splitInstance(parent, shellLaunchConfig);
+			instance = await this._terminalEditorService.splitInstance(parent, shellLaunchConfig);
 		} else {
 			const group = this._terminalGroupService.getGroupForInstance(parent);
 			if (!group) {
diff --git a/src/vs/workbench/test/browser/workbenchTestServices.ts b/src/vs/workbench/test/browser/workbenchTestServices.ts
index 46a6cff15b5ab..5f477c590d6f9 100644
--- a/src/vs/workbench/test/browser/workbenchTestServices.ts
+++ b/src/vs/workbench/test/browser/workbenchTestServices.ts
@@ -1819,7 +1819,7 @@ export class TestTerminalEditorService implements ITerminalEditorService {
 	onDidChangeInstances = Event.None;
 	openEditor(instance: ITerminalInstance, editorOptions?: TerminalEditorLocation): Promise<void> { throw new Error('Method not implemented.'); }
 	detachInstance(instance: ITerminalInstance): void { throw new Error('Method not implemented.'); }
-	splitInstance(instanceToSplit: ITerminalInstance, shellLaunchConfig?: IShellLaunchConfig): ITerminalInstance { throw new Error('Method not implemented.'); }
+	splitInstance(instanceToSplit: ITerminalInstance, shellLaunchConfig?: IShellLaunchConfig): Promise<ITerminalInstance> { throw new Error('Method not implemented.'); }
 	revealActiveEditor(preserveFocus?: boolean): Promise<void> { throw new Error('Method not implemented.'); }
 	resolveResource(instance: ITerminalInstance): URI { throw new Error('Method not implemented.'); }
 	reviveInput(deserializedInput: IDeserializedTerminalEditorInput): TerminalEditorInput { throw new Error('Method not implemented.'); }